idk why I'm even wasting my time responding to obviously wrong things - just go look it up, he's been tenured before. he was actually offered tenure in 1993 but left because he disagreed with Larry Summers, then president of Harvard, at the time.
Haters gonna...
Sigh.
He's done a lot of good as a civically-involved public intellectual and debater than most academics do writing research papers few people read to "move the needle" towards where many things need to go. I sometimes say about sales and influence: You can build a viable fusion reactor, but if no one knows about it, it may as well not even exist.